SECTION 1. If any person shall go armed with a concealed dirk, dagger, sword, pistol, or pistols, revolver, slung-shot, brass knuckles, or other offensive and dangerous weapon, he shall, on conviction thereof, be adjudged guilty of a misdemeanor, and shall be punished by imprisonment in the state prison for a term of not more than two years, or by imprisonment in the couny jail of the proper county not more than twelve months, or by fine not exceeding five hundred dollars, together with the costs of prosecution, or by both said fine and costs and either of said imprisonments; and he may also be required to find sureties for keeping the peace and against the further violation of this act for a term not exceeding two years: provided, that so going armed shall not be deemed a violation of this act whenever it shall be made to appear that such person had reasonable cause to fear an assault or other injury or violence to his person, or to his family or property, or to any person under his immediate care or custody, or entitled to his protection or assistance, or if it be made to appear that his possession of such weapon was for a temporary purposes, and with harmless intent.